Pile Testing

[UP830]

I am looking to expand my knowledge on pile load testing and trying to follow an example that I have found in many bi directional load cell reports.

I am trying to create the equivalent top down load test curve. I can create the rigid pile curve as this is just reading displacement at say 1mm and reading the top and bottom plate loads corresponding to 1mm and adding them together.

Figure D

The issue is trying to modify the curve to allow for elastic compression.

The attached example includes a table showing Load on upper plate, load on bottome plate, P (which is sum of the two), then elastic pile settlement [sub]TLT[/sub], this is what i cant seem to work out. I can calculate pile settlement[sub]OLT[/sub]

pile settlement[sup]OLT[/sup] is the C1 correction middle formulae on pg 5 of 7 PDF.

I thought pile settlement[sub]OLT[/sub], would be the middle formulae on page 6 of 7, for Centroid Factor C1 but the results done match. Even using C1 = 1/3 or C1=1/2 formulae the elastic pile settlement from top load test doesnt match. The answers I am getting are shown below.

Hopefully someone can help!

Thanks.

J

 

[ATSE]

Please specify where you are from, and what guide you are referencing. This will provide context. Also, you are referencing a document that is not attached, and variables that are not defined.

Why doesn't your load test pile plot show the rebound portion of the curve? Without this, you are lacking a complete picture of pile behavior.

You need an estimate of the neutral plane in order to estimate pile elastic strain. If you know for sure you have an end bearing pile, then you can simply use L = pile length. Otherwise, L will be something less.

 

[EireChch]

This is for a project in the Las Vegas. Sorry forgot to attach the whole doc and am out of the office but you can find the example calc in the below link. Pg 36_44

https://www.nevadadot.com/home/showdocument?id=4686

Seems to be the sample calc in a lot of load cell reports

This calculation should be what you are looking for